[RDF] Create individual phi for each indivisible register This isn't quite using register units, but it's getting close. The phi generation is driven by register units, but each phi still contains a reference to a register, potentially with a mask that amounts to a unit. In cases of explicit register aliasing this may still create phis with references that are aliased, whereas separate phis would ideally contain disjoint references (this is all within a single basic block). Previously phis used maximal registers, now they use minimal. This is a step towards both, using register units directly, and a simpler liveness calculation algorithm. The idea is that a phi cannot reach a reference to anything smaller than the phi itself represents. Before there could be a phi for R1_R0, now there will be two for this case (assuming R0 and R1 have one unit each).
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